ILLINOIS TREES: SELECTION. PLANTING. AND CARE 123 



ACKNOWLEDGMENTS 



My sincere appreciation is extended to all those who have 

 assisted or advised in any way in the assembling of material and 

 in preparation of this circular. 



I am grateful to my wife, Lucile, for her encouragement 

 during the preparation of this circular; to Dr. Robert A. Evers, 

 Botanist, Illinois Natural History Survey, who critically read, 

 for accuracy of scientific names and tree descriptions, the portion 

 of the circular in which 52 genera of trees are illustrated and 

 described ; and to Owen F. Glissendorf , Editor, Natural History 

 Survey, for his assistance in editing the manuscript. 



Suggestions made by John C. Lanphear and William P. Lan- 

 phear HI, Forest City Tree Protection Co., South Euclid, Ohio, 

 and by John Z. Duling, Duling Tree Expert Co., Inc., Muncie, 

 Indiana, have added greatly to the accuracy of the information 

 presented in the portions of the circular on tree planting and 

 care. 



The photographic illustration for figure 91 was furnished 

 through the courtesy of the Morton Arboretum, Lisle, Illinois. 



The remaining photographs and illustrations were taken or 

 drawn by current and former staff members of the Natural 

 History Survey and by Ray R. Hamm, former Manager of the 

 University of Illinois Photographic and Blueprinting Labora- 

 tory. Most of the photographs were taken by Dr. J. L. Forsberg, 

 Wilmer D. Zehr, William E. Clark, and the author. 



